Light source device and projector

ABSTRACT

A light source device includes a plurality of solid-state light sources, and a base member on which the plurality of solid-state light sources are provided, wherein each of the solid-state light sources includes a stem on which a light-emitting element is provided and terminals connected to the light-emitting element, and the base member includes a hole portion into which one of the terminals is inserted and a planar portion that is in contact with the stem.

BACKGROUND

1. Technical Field

The present invention relates to a light source device and a projector,and more particularly, to a light source device and a projector whichhave solid-state light sources.

2. Related Art

In the related art, a projector is known which includes a light sourcedevice, a light modulating device that forms an image according to imageinformation through modulation of light emitted from the light sourcedevice, and a projection optical device that expands and projects theimage on a projection surface such as a screen.

As such a light source device, a light source device having a dischargelight source lamp such as an extra-high pressure mercury lamp has beenadopted. However, recently, from the request of power saving, a lightsource device having solid-state light sources has been adopted. As sucha light source device, a light source device having solid-state lightsources, such as LEDs (Light Emitting Diodes) and LDs (Laser Diodes),has been adopted (for example, see JP-A-9-246657).

The light source device described in JP-A-9-246657 includes a printedsubstrate, a semiconductor laser mounted on the printed substrate, abase supporting the semiconductor laser, a collimator lens, and anaperture forming member. Among them, the semiconductor laser ispress-fitted and fixed from the back side of the base into a steppedfitting hole formed to penetrate the front and back of the base, and thebase is screw-fixed to the printed substrate. Further, the collimatorlens is arranged on the front side of the fitting hole, and the apertureforming member that shapes laser beams emitted from the semiconductorlaser through the collimator lens is provided to cover the collimatorlens.

Here, in the light source device described in JP-A-9-246657, heatgenerated in the semiconductor laser is conducted to the base throughthe inner surface of the fitting hole, into which the semiconductorlaser is fitted, to be dissipated. In this configuration, since it isnecessary to provide the base according to the semiconductor laser,there is a problem that it is difficult to densely mount thesemiconductor laser on the printed substrate. Further, in the case ofmounting the semiconductor laser on the printed substrate withoutproviding the base, the heat generated in the semiconductor laser is notproperly dissipated since the semiconductor laser and the printedsubstrate are spaced apart from each other, and this causes a problemthat the cooling efficiency of the semiconductor laser is reduced.

From such a problem, configurations that can efficiently cool eachsemiconductor laser even if the semiconductor laser is densely arrangedhave been requested.

SUMMARY

An advantage of some aspects of the invention is to provide a lightsource device and a projector that can effectively cool solid-statelight sources.

An aspect of the invention is directed to a light source device, whichincludes a plurality of solid-state light sources; and a base member onwhich the plurality of solid-state light sources are provided, whereineach of the plurality of solid-state light sources includes a stem onwhich a light-emitting element is provided and a terminal connected tothe light-emitting elements, and the base member includes a hole portioninto which the terminal is inserted and a planar portion that is incontact with the stem.

Examples of the solid-state light source include LDs and LEDs.

According to the aspect of the invention, the base member on which theplurality of solid-state light sources are provided has the planarportion that is in contact with the stem of each of the solid-statelight sources. Through this, a heat conduction path from the respectivesolid-state light source to the base member can be ensured, and the heatgenerated from the respective solid-state light sources can bedissipated through one base member. Accordingly, even if the solid-statelight sources are densely arranged on the base member, the respectivesolid-state light sources can be effectively cooled.

In the aspect of the invention, it is preferable that the planar portionbe in contact with a surface of the stem that is opposite the side onwhich the light-emitting elements are provided.

Here, the surface opposite the surface on which the light-emittingelement is provided has a relatively large area in the solid-state lightsource. Because of this, by making the opposite surface be in contactwith the planar portion, the heat conduction efficiency of thesolid-state light sources to the base member can be improved as comparedwith the case where the outer peripheral surface of the stem is incontact with the planar portion, as in the configuration described inJP-A-9-246657 as described above. Accordingly, the respectivesolid-state light sources can be cooled more effectively.

Further, in the case where the above-described light-emitting elementand a post that supports the side of the light-emitting element areeccentrically provided on the stem, on the bottom surface of the stem,the temperature of a position corresponding to the post becomes highest.Through this, by making the bottom surface of the stem be in contactwith the planar portion, the heat conducted from the light-emittingelement through the post can be effectively conducted to the basemember. Accordingly, the solid-state light sources can be cooled moreeffectively.

Further, by making the bottom surface of the stem be in contact with theplanar portion, it is possible to make the directions of the respectivesolid-state light sources arranged on the base member coincide with eachother. Through this, the directions of the light emitted from therespective solid-state light sources can be easily adjusted.Accordingly, in the case of emitting the light from the respectivesolid-state light sources through an optical component (for example,parallelization lens), efforts to fine-adjust the direction in theoptical axis direction of the optical component can be reduced.

In the aspect of the invention, it is preferable to provide a positiondetermination member which is mounted on the base member and is providedwith a position determination unit that determines the positions of therespective solid-state light sources.

According to the aspect of the invention, since the positions of therespective solid-state light sources are determined on the base memberby the position determination unit of the position determination member,the positional accuracy of the respective solid-state light sources canbe improved.

Further, if the position determination member has heat conductivity, apath of heat conducted from the peripheral surface of the stem to theposition determination unit through the position determination unit canbe ensured in addition to a path of heat conducted from the bottomsurface of the stem through the planar portion. Accordingly, the coolingof the solid-state light sources can be performed more effectively.

In the aspect of the invention, it is preferable to provide a substratewhich is arranged on the opposite side of the planar portion of the basemember and is in electrical contact with the terminal that is insertedinto and passes through the hole portion.

Here, in the case where the substrate that is in contact with theterminal of the solid-state light source is arranged on the side of theplanar portion on which the stem is positioned, it is necessary toensure a space for arranging the substrate, and thus the contact area ofthe bottom surface of the stem with the planer portion becomes reduced.

For this, in the aspect of the invention, the substrate is arranged onthe opposite side to the planar portion side. Through this, the contactbetween the bottom surface of the stem and the planar portion is notobstructed by the arrangement of the substrate, and thus the contactarea of the bottom surface of the stem with the planar portion can beincreased as compared with the case where the substrate is positioned onthe stem side. Accordingly, the heat conduction from the stem to thebase member can be efficiently performed, and thus the solid-state lightsources can be cooled more effectively.

In the aspect of the invention, it is preferable that the plurality ofsolid-state light sources be arranged along one direction, and theterminal include a first terminal and a second terminal provided on asurface that is opposite a surface on which the light-emitting elementsare provided on the stem. It is preferable that a direction for thefirst terminal and the second terminal being connected be a directionthat is along the one direction, and a length direction of the substrateis a direction that is along the one direction.

Here, if the length direction of the substrate and the direction for thetwo terminals being connected are orthogonal to each other, it isnecessary to ensure width dimension that is greater than the dimensionfor connecting at least two terminals (dimension in a directionorthogonal to the length direction when the substrate is viewedplanarly) on the substrate.

For this, according to the aspect of the invention, since the lengthdirection of the substrate and the direction for the two terminals beingconnected are the same, the width dimension of the substrate can bereduced. Further, since the direction for the two terminals beingconnected is substantially the same as those of the respectivesolid-state light sources, a smaller substrate can be used throughforming of the substrate along the corresponding direction. Accordingly,miniaturization of the substrate can be sought and the manufacturingcost of the substrate can be reduced. In addition, since the area thatis covered by the substrate on the base member can be reduced, the heatof the solid-state light sources which is conducted to the base membercan be effectively cooled.

In the aspect of the invention, it is preferable that a groove portionin which the substrate is arranged be formed on a surface that isopposite the planar portion side of the base member.

According to the aspect of the invention, since the substrate isarranged in the groove portion formed on the base member, the substratecan be stably arranged.

Further, if the groove portion is not formed in the case where a heatdissipation member such as a heat sink is in contact with the surfaceopposite the planar portion side that is in contact with the bottomsurface of the stem on the base member, the contact between the oppositesurface and the heat dissipation member may be obstructed by thesubstrate.

For this, by forming the groove portion in which the substrate isarranged on the surface opposite the stem side on the base member, theopposite surface and the heat dissipation member can be certainly incontact with each other, and the contact area can be expanded.Accordingly, the heat of the solid-state light sources conducted to thebase member can be effectively conducted to the heat dissipation member,and thus the solid-state light sources can be cooled more effectively.

Another aspect of the invention is directed to a projector whichincludes the above-described light source device, a light modulatingdevice modulating light flux emitted from the light source device, and aprojection optical device projecting the modulated light flux.

According to the aspect of the invention, the same effect as theabove-described light source device can be achieved. Further, throughthis, the lifespan of the light source device can be extended, and thusthe hassle of maintenance of the projector, such as a replacement of thelight source device, can be saved.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements.

FIG. 1 is a schematic diagram illustrating the configuration of aprojector according to a first embodiment of the invention.

FIG. 2 is a schematic diagram illustrating a first light source deviceaccording to the first embodiment.

FIG. 3 is an exploded perspective view illustrating a light source unitaccording to the first embodiment.

FIG. 4 is a perspective view illustrating a solid-state light sourceaccording to the first embodiment.

FIG. 5 is a plan view illustrating a part of a light source unitaccording to the first embodiment.

FIG. 6 is a cross-sectional view illustrating apart of a light sourceunit according to the first embodiment.

FIG. 7 is a plan view illustrating a part of a light source unitaccording to a modification of the first embodiment.

FIG. 8 is a plan view illustrating a pressing member of a projectoraccording to a second embodiment of the invention.

FIG. 9 is a plan view illustrating a pressing member of a projectoraccording to a third embodiment of the invention.

FIG. 10 is a plan view illustrating a pressing member according to amodification of the third embodiment.

FIG. 11 is a plan view illustrating a pressing member of a projectoraccording to a fourth embodiment of the invention.

FIG. 12 is a plan view illustrating a pressing member according to amodification of the fourth embodiment.

FIG. 13 is a perspective view illustrating a light source unit of aprojector according to a fifth embodiment of the invention.

FIG. 14 is an exploded perspective view illustrating a light source unitof a projector according to a sixth embodiment of the invention.

FIG. 15 is a cross-sectional view illustrating apart of the light sourceunit according to the sixth embodiment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS First Embodiment

Hereinafter, a first embodiment of the invention will be described withreference to the accompanying drawings.

Overall Configuration of Projector

Projector 1 according to the first embodiment of the invention forms animage according to image information through modulation of light fluxemitted from a light source device provided therein, and expands andprojects the image on a projection surface such as a screen. Such aprojector 1, as shown in FIG. 1, includes a case 2 made of metal orsynthetic resin and an optical device 3 accommodated in the case 2. Inaddition, although not illustrated, the projector 1 includes a controldevice controlling the operation of the projector 1, a power supplydevice supplying power to electronic components that constitute theprojector 1, and a cooling device cooling a target to be cooled such asthe light source device.

Configuration of Optical Device

The optical device 3 forms an image according to an image signal inputfrom the above-described control device, and projects the image. Theoptical device 3 includes a first light source device 4, a second lightsource device 5, a uniform illumination device 31, a color separationdevice 32, a relay device 33, a light modulating device 34, a colorsynthesis device 35, and a projection optical device 36.

The first light source device 4 emits light including green light andred right toward a dichroic mirror 312 that constitutes the uniformillumination device 31. Further, the configuration of the first lightsource device 4 will be described in detail later.

The second light source device 5 emits blue light toward a totalreflection mirror 311 that constitutes the uniform illumination device31. Although not illustrated in detail, in the second light sourcedevice 5, a plurality of LDs (Laser Diodes) or LEDs (Light EmittingDiodes) that emit blue light are arranged.

The uniform illumination device 31 synthesizes the lights incident fromthe first light source device 4 and the second light source device 5,and substantially uniformly illuminates the respective light modulatingdevices 34 to be described later using the synthesized light. Thisuniform illumination device 31 includes the total reflection mirror 311,the dichroic mirror 312, a pair of lens arrays 313 and 314, apolarization conversion element 315, and a superimposition lens 316.

The total reflection mirror 311 reflects the blue light incident fromthe second light source device 5 toward the dichroic mirror 312.

The dichroic mirror 312 transmits and leads the light, which includesthe green light and the red light incident from the first light sourcedevice 4, to the lens array 313, and reflects the blue light, which isincident from the second light source device 5 through the totalreflection mirror 311, toward the lens array 313.

The lens array 313, although not illustrated, has small lenses thatdivide the light flux incident from the dichroic mirror 312 into aplurality of partial light fluxes.

The lens array 314 has small lenses that correspond to the small lensesof the lens array 313, and superimposes the respective partial lightfluxes incident from the lens array 313 on the light modulating device34 together with the superimposition lens 316.

The polarization conversion element 315 is arranged between the lensarray 314 and the superimposition lens 316, and converts the light fromthe lens array 314 into one type of linearly polarized light.

The color separation device 32 separates respective color lights of red(R), green (G), and blue (B) from the light incident from the uniformillumination device 31. This color separation device 32 includes adichroic mirror 321 that transmits the blue light and reflects the greenlight and the red light, a dichroic mirror 322 that reflects the greenlight toward the light modulating device 34 (34G) for green light andtransmits the red light, and a reflection mirror 323 that reflects andleads the incident blue light to the light modulating device 34 (34B)for blue light.

The relay device 33 leads the red light transmitted through the dichroicmirror 322 to the light modulating device 34 (34R) for red light, andincludes an incident side lens 331, a relay lens 333, and totalreflection mirrors 332 and 334. Although this relay device 33 is toprevent the deterioration of utilization efficiency of the red light dueto diffusion or the like, it may be configured to transmit another colorlight (for example, blue light) instead of the red light.

The light modulating device 34 (light modulating devices for red light,green light, and blue light are respectively denoted by 34R, 34G, and34B) forms an image according to the image signal input from the controldevice through modulation of the incident light flux. Although notillustrated in detail, the light modulating device 34 includes a liquidcrystal panel that is driven according to the image signal and a liquidcrystal light valve having a pair of polarizing plates sandwiching theliquid crystal panel.

The color synthesis device 35 is composed of a cross dichroic prism.This color synthesis device 35 forms a full-color image light throughsynthesis of modulated light (image) for each color light that isincident from the respective light modulating device 34.

The projection optical device 36 expands and projects the imagesynthesized by the color synthesis device 35 on the projection surface.This projection optical device 36, although not illustrated in detail,is configured as a lens pair having a lens tube and a plurality oflenses arranged in the lens tube.

Configuration of First Light Source Device

FIG. 2 is a schematic diagram illustrating the configuration of thefirst light source device 4.

The first light source device 4 corresponds to the light source deviceaccording to the invention, and as described above, emits the lightincluding the green light and the red light to the dichroic mirror 312.As shown in FIG. 2, the first light source device 4 includes alightsource unit 41, a reflection mirror 42, a condensing lens 43, a case 44,a parallelization lens 45, a uniformization device 46, a dichroic prism47, a pickup lens 48, and a wavelength conversion device 49.

The light source unit 41 includes a plurality of solid-state lightsources 411 and a plurality of parallelization lenses 418 providedaccording to the respective solid-state light sources 411, and makes thelights emitted from the respective solid-state light sources 411incident to the reflection mirror 2 through the parallelization lens418. Further, in this embodiment, each of the solid-state light sources411 is composed of LDs emitting color light (for example, color light ofultraviolet region or blue light) of a predetermined wavelength. Theconfiguration of the light source unit 41 will be described in detaillater.

The reflection mirror 42 is formed in a rectangular shape viewed fromthe front, and is provided depending on the column of the solid-statelight sources 411. The reflection mirror 42 reflects parallel lightsincident from the solid-state light sources 411 through theparallelization lens 418 substantially parallel to each other toward thecondensing lens 43. Further, in this embodiment, the reflection mirror42 is provided for each column of the solid-state light sources 411.However, the invention is not limited thereto, and the reflection mirror42 may be provided according to the respective solid-state light sources411.

The condensing lens 43 collects the lights incident from the respectivereflection mirrors 42 into light flux, and emits the light flux towardthe parallelization lens 45.

The case 44 is formed of metal or synthetic resin, and holds therespective reflection mirrors 42 and the condensing lens 43 therein. Thelight source unit 41 is mounted on the case 44.

The parallelization lens 45 converts the incident light flux intoparallel light along the center axis of the light flux, and emits theparallel light to the uniformization device 46.

The uniformization device 46 uniformizes the in-plane illumination(illumination in the plane that is orthogonal to the center axis of thelight flux) of the light flux incident from the parallelization lens 45.The uniformization device 46 includes a first lens array 461 and asecond lens array 462, which have the same configuration as theabove-described lens arrays 313 and 314, and a support member 463.

The dichroic prism 47 has a separation layer 471 which reflects thelight of less than a predetermined wavelength and transmits the light ofequal to or more than the predetermined wavelength. In this embodiment,the separation layer 471 reflects the light of ultraviolet region thatis incident from the uniformization device 46 toward the pickup lens 48,and bends the light path of the light at about 90 degrees. Further, theseparation layer 471 transmits the light (light wavelength-converted bythe wavelength conversion device 49) incident through the pickup lens48. The light transmitted through the separation layer 471 is incidentto the above-described dichroic mirror 312.

The pickup lens 48 superimposes the respective partial light fluxesincident through the dichroic prism 47 on a predetermined region of aphosphor layer 4911 of the wavelength conversion device 49. In addition,the pickup lens parallelizes the light wavelength-converted by thewavelength conversion device 49 and makes the parallelized lightincident to the dichroic mirror 312 through the dichroic prism 47.

The wavelength conversion device 49 converts the wavelength of theincident light and emits the converted light. The wavelength conversiondevice 49 includes a wheel 491 and a rotary unit 492.

Among them, the rotary unit 492 is composed of a wheel motor thatrotates the central axis of the wheel 491 as a rotating axis. As beingrotated by the rotary unit 492, the wheel 491 is cooled.

The wheel 491 includes a reflection layer 4912 formed on a surfaceopposite the pickup lens 48 by vapor deposition of silver and a phosphorlayer 4911 laminated on the reflection layer 4912. The phosphor layer4911 includes phosphor which absorbs the light incident from the pickuplens 48 to be excited and emits light of a predetermined wavelength inall directions. Further, in this embodiment, the phosphor absorbs thelight of ultraviolet region and emits light including the green lightand red light. The light wavelength-converted by the phosphor isreflected by the reflection layer 4912 to be incident to the pickup lens48, transmitted through the pickup lens 48 and the dichroic prism 47,and then incident to the dichroic mirror 312, in addition to beingdirectly incident to the pickup lens 48.

Configuration of Light Source Unit

FIG. 3 is an exploded perspective view illustrating the light sourceunit 41. In the following description and illustration, it is assumedthat when the base member 412 is viewed from the front, directionsorthogonal to each other are X direction and Y direction, and adirection which is orthogonal to a front portion 412A of the base member412 and is away from the front portion 412A is Z direction. Further, inthis embodiment, the X direction is a direction along the lengthdirection of the front portion 412A.

As described above, the light source unit 41 emits lights from therespective solid-state light sources 411 and makes the emitted lightsincident to the respective reflection mirrors 42 through theparallelization lens 418. As shown in FIG. 3, the light source unit 41includes the base member 412, a spacer 413, a pressing member 414, afixing member 415, a substrate 416, and a heat dissipation member 417(see FIG. 2) in addition to the respective solid-state light sources 411and the respective parallelization lenses 418.

Among them, the heat dissipation member 417 is a heat sink which isheat-conductively connected to a rear portion 412B of the base member412 to dissipate the heat conducted from the base member 412. The heatdissipation member 417 includes a plurality of fins, and between thesefins, cooling air that blows from the above-described cooling device isdistributed. Through this, the heat dissipation member 417, and further,the base member 412 and the solid-state light sources 411 are cooled.

Configuration of Solid-State Light Source

FIG. 4 is a perspective view illustrating a solid-state light source411.

The solid-state light source 411, as shown in FIG. 4, includes a stem4111, a post and a light-emitting element (not illustrated) arranged onan upper surface 4111A of the stem 4111, a cap 4114, and a pair ofterminals 4116.

The stem 4111 is a substantially circular plate-like body in plane view.On a side surface of the stem 4111, a pair of first concave portions4112 positioned opposite each other and a second concave portion 4113positioned in the middle of the pair of first concave portions 4112 areformed. Into the second concave portion 4113, a convex portion 4132 of aspacer 413 to be described later is inserted.

Although not illustrated in detail, the post is formed in a semicircularcolumnar, and a light-emitting element is provided on the side surfaceof the post. As viewed from a position opposite the upper surface 4111A,this light-emitting element is positioned substantially in the center ofthe upper surface 4111A. Because of this, the post is eccentricallyarranged on the upper surface 4111A. The post functions to conduct theheat generated from the light-emitting element to the stem 4111.

The cap 4114 is provided on the upper surface 4111A to cover the postand the light-emitting element. On the cap 4114, a substantiallycircular opening 4115 in a plan view is formed to transmit the lightemitted from the light-emitting element.

The pair of terminals 4116 are extended from the bottom surface 4111B ofthe stem 4111 in substantially the same dimensions. One of the pair ofterminals 4116 corresponds to the first terminal according to theinvention, and the other terminal corresponds to the second terminalaccording to the invention. In the following description, the directionconnecting the pair of terminals 4116 is a direction connecting the pairof terminals 4116 when the solid-state light source 411 is viewed fromthe side of the cap 4114 in a plan view, and is described andillustrated as A direction.

Configuration of Base Member

Referring again to FIG. 3, the base member 412 is formed of heatconductive metal (for example, aluminum) in a substantially rectangularparallelepiped shape as a whole. The front portion 412A of the basemember 412 is a surface on which stems 4111 of the respectivesolid-state light sources 411 are arranged, and is formed in a planarshape. That is, the front portion 412A and the bottom surface 4111B ofthe stem 4111 are in surface contact with each other. The front portion412A functions as the planar portion and an arrangement surfaceaccording to the invention.

The base member 412 has a plurality of hole portions 4121 formed topenetrate through the base member 412 from the front portion 412A to therear portion 412B. The hole portions 4121 are in an elliptical shape ina plan view, and are formed in a matrix shape so as to form a pluralityof rows and a plurality of columns along the X direction and Ydirection. Through this, in the front portion 412A, the solid-statelight sources 411 are arranged in a matrix shape so as to form aplurality of rows and a plurality of columns. Further, in thisembodiment, total 16 hole portions 4121 of 4 rows and 4 columns areformed.

A pair of terminals 4116 are inserted into the hole portions 4121. Themajor axis direction of the hole portion 4121 is the X direction, andwhen the terminal 4116 is inserted into the hole portion 4121, thedirection (A direction) connecting the pair of terminals 4116 coincideswith the X direction.

In addition, on the front portion 412A, a plurality of screw holes forfixing screws (not illustrated) for fixing the spacer 413, the pressingmember 414, and the fixing member 415 to the base member 412 and aplurality of holes for fixing the base member 412 to another member areformed.

On the rear portion 412B of the base member 412, a plurality of grooveportions 4122 along the X direction are formed depending on the lines ofthe hole portions 4121. In other words, the respective groove portions4122 are formed depending on the positions of the adjacent hole portions4121 along the X direction. In these groove portions 4122, thesubstrates 416 are arranged.

Configuration of Substrate

The substrate 416 is electrically connected to the terminals 4116inserted into the hole portions 4121 on the side of the rear portion412B thereof. The substrate 416 is formed in a rectangular shape in aplan view in which the length direction becomes the X direction, and inother words, the substrate 416 has a shape elongated along the Adirection that is the direction connecting a pair of terminals 4116inserted into the hole portions 4121. On the substrate 416, holeportions 4161 into which the terminals 4116 are inserted are formed.

Configuration of Spacer

The spacer 413 is a metal member that is in a substantially rectangularshape in a plan view and has heat conductivity. The spacer 413 is fixedto the base member 412 by screws (not illustrated) together with thepressing member 414 and the fixing member 415 to be described later. Thespacer 413 corresponds to the position determination member according tothe invention, and in positions corresponding to the hole portions 4121of the spacer 413, substantially circular openings 4131 are formed topenetrate through the spacer 413 in the thickness direction (Zdirection). That is, the openings 4131 are formed in a matrix shape soas to form a plurality of rows and a plurality of columns along the Xdirection and the Y direction.

Further, the thickness dimension of the spacer 413 is set to a valuesmaller than the thickness dimension of the stem 4111 of the solid-statelight source 411 to be described later.

FIG. 5 is a plan view showing an enlarged part of the light source unit41.

In the opening 4131, as shown in FIG. 5, a solid-state light source 411is arranged. At an edge of the opening 4131, a convex portion 4132 isformed as an engagement portion engaged with the solid-state lightsource 411. Specifically, the convex portion 4132 is inserted into thesecond concave portion 4113 of the stem 4111, and through this, theposition of the solid-state light source 411 is determined in theopening 4131. That is, the opening 4131 and the convex portion 4132function as a position determination unit.

Configuration of Pressing Member

Referring again to FIG. 3, the pressing member 414 presses thesolid-state light source 411 of which the terminals 4116 are insertedinto the hole portions 4121 to the front portion 412A, and through this,fixes the solid-state light source 411 to the front portion 412A. Thepressing member 414 is provided to cover the spacer 413 when it ismounted on the front portion 412A. The pressing member 414 is formed bya sheet-like elastic member having dimensions substantially the same asthe spacer 413 in a plan view, and for example, is formed by stamping arelatively thin metal plate.

In the pressing members 414, a plurality of the openings 4141 of thesubstantially rhombic shape in a plan view are formed on positionscorresponding to openings 4131 of the spacer 413 so as to penetratethrough the pressing member 414 in the thickness direction (Zdirection). That is, the openings 4141 are formed according to thesolid-state light sources 411 positioned by the spacer 413 in a matrixshape so as to form a plurality of rows and a plurality of columns alongthe X direction and the Y direction. The openings 4141 are openings fortransmitting the lights emitted from the solid-state light sources 411.

In opposite positions at edge of the opening 4141, a pair of projections4142 are formed to project from the edge toward the inside of theopening 4141 as the pressing portion. The projections 4142 may be platesprings that pressingly fix the solid-state light source 411 toward thefront portion 412A in contact with the upper surface 4111A of the stem4111 when the pressing member 414 is mounted on the base member 412.

Further, the projection directions of the projections 4142 from theedges of the openings 4141 are the same in the respective openings 4141,but these directions are inclined with respect to the X direction thatis the row direction of the solid-state light source 411 and the Ydirection that is the column direction thereof. In this embodiment,these inclination angles are set to 45 degrees with respect to the Xdirection and the Y direction. Since each of the projections 4142 ispositioned in the gap between the solid-state light sources 411 throughthis configuration, the projections 4142 can be reliably in contact withthe solid-state light sources 411 even if the solid-state light sources411 are densely arranged. Accordingly, the pressing forces of the frontportions 412A can surely act on the solid-state light sources 411.

Here, the respective projections 4142 are elastically deformed when thestem 4111 is pressed since the pressing member 414 is formed by theelastic member. However, in this embodiment, the projection 4142 pressesthe stem 4111 using the plastic region rather than the elastic region.This is due to the following reasons.

The first reason is that in order to ensure the pressing force (springforce) to pressingly fix the solid-state light sources 411 in the caseof using the elastic region, it is necessary to increase the projectiondimension of the projection 4142. For this, by using the plastic regionin which the spring force is great rather than the elastic region inwhich the spring force is small, the projection dimension thereof can bereduced, and thus the openings 4141, and further, the solid-state lightsources 411 can be densely arranged.

The second reason is that although the projections 4142 are deformed inthe plastic region, the change of the spring force applied to the stem4111 with respect to the displacement amount of the projections 4142becomes small. That is, if variations occur in dimensions (dimensions inZ direction) in the thickness direction of the stem 4111 due toindividual differences in the solid-state light sources 411, thedisplacement amount of the projections 4142 that are in contact with theupper surface 4111A varies. However, even if the displacement amount ofthe projections 4142 varies, the change of the spring force applied tothe stem 4111 is small, and thus the spring forces (pressing forces)with respect to the respective solid-state light sources 411 can besubstantially uniformized. Further, since the removal of the pressingmember 414 from the base member 412 is not frequently done even if theprojections 4142 are plastically deformed, a major problem may not occureven if the deformation of the projections 4142 remains.

Further, the projection 4142 is formed in a substantially trapezoidalshape in a plan view in which the width dimension becomes smaller as theprojection 4142 is directed from the edge of the opening 4141 to theinside of the opening 4141. In other words, the respective projections4142 are formed so that the width dimension on the edge side of theopening 4141 becomes large and the width dimension becomes smallertoward the center of the opening 4141 from the edge thereof. Because ofthis, when the projections 4142 press the solid-state light source 411,a large load applied to an area in the vicinity of the edge of theopening 4141 can be dispersed in the projections 4142. Accordingly,damage of the projections 4142 can be suppressed.

Configuration of Fixing Member

The fixing member 415 is formed of rigid metal in a rectangular shapehaving dimensions substantially the same as the spacer 413 and thepressing member 414 in a plan view. This fixing member 415 isscrew-fixed to the front portion 412A in a state where the spacer 413and the pressing member 414 are placed between the fixing member 415 andthe front portion 412A, and thus fixes the spacer 413 and the pressingmember 414 to the front portion 412A.

The fixing member 415 has a plurality of rhombic-shaped openings 4151 ina plan view in positions in accordance with the opening 4131 and theopening 4141. These openings 4151 are formed in a matrix shape so as toform a plurality of rows and a plurality of columns along the Xdirection and the Y direction depending on the arrangement of thesolid-state light sources 411. Through the openings 4151, the lightsfrom the solid-state light sources 411 arranged on the base member 412are emitted to the outside of the light source unit 41.

Fixing of Solid-State Light Source

FIG. 6 is a cross-sectional view illustrating the light source unit 41.

Here, the fixing of the solid-state light sources 411 to the base member412 will be described.

First, the spacer 413 is arranged on the front portion 412A, and a pairof terminals 4116 are inserted into the hole portions 4121, so that thesolid-state light sources 411 are arranged in the respective openings4131 of the spacer 413. At this time, the respective solid-state lightsources 411 are arranged so that the convex portions 4132 are insertedinto the second concave portions 4113 of the stems 4111. Through this,the position of the solid-state light source 411 is determined on thefront portion 412A. In this state, the X direction which is the rowdirection of the respective hole portions 4121 and is also the majoraxis direction of the hole portions 4121 coincides with the A directionthat is the direction connecting a pair of terminals 4116.

Next, the pressing member 414 is arranged to cover the spacer 413. Inthis state, the projections 4142 formed at the edges of the respectiveopenings 4141 of the pressing member 414 are in contact with an areawhere the first concave portion 4112 and the second concave portion 4113are not formed on the upper surface 4111A of the stem 4111.

Then, after the fixing member 415 is arranged to cover the pressingmember 414, screws that penetrate through the spacer 413, the pressingmember 414, and the fixing member 415 are fixed to the base member 412.Through this, as shown in FIG. 6, the solid-state light source 411, thespacer 413, the pressing member 414, and the fixing member 415 are fixedto the base member 412. In this state, by the projections 4142 of thepressing member 414, the respective solid-state light sources 411 arepressed toward the planar front portion 412A, and the bottom surface4111B of the stem 4111 and the front portion 412A are in surface contactwith each other.

Thereafter, the terminals 4116 exposed to the side of the rear portion412B are connected to the respective substrates 416, and the respectivesubstrates 416 are received in the groove portions 4122. Further, theheat dissipation member 417 is mounted on the rear portion 412B. In theabove-described order, the light source unit 41 is assembled.

The projector 1 according to this embodiment as described above has thefollowing effects.

The base member 412 has the planar front portion 412A that is in surfacecontact with the stems 4111 of the respective solid-state light sources411. Through this, a heat conduction path from each of the solid-statelight sources 411 to the base member 412 can be ensured, and the heatgenerated from the plurality of solid-state light sources 411 can bedissipated through one base member 412. Accordingly, even if thesolid-state light sources 411 are densely arranged on the base member412, the respective solid-state light sources 411 can be effectivelycooled.

Here, in the stem 4111, the bottom surface 4111B opposite the surface onwhich the light-emitting elements are provided has a relatively largearea in the solid-state light source 411. Because of this, by making thebottom surface 4111B and the front portion 412A be in surface contactwith each other, the heat conduction efficiency of the solid-state lightsources 411 to the base member 412 can be improved as compared with thecase where the outer peripheral surface (side surface) of the stem 4111and the front portion 412A are in contact with each other. Accordingly,the respective solid-state light sources 411 can be cooled moreeffectively.

Further, a post that supports the side of the light-emitting elements iseccentrically provided on the upper surface 4111A of the stem 4111, andon the bottom surface 4111B of the stem 4111, the position correspondingto the post becomes the position having the highest temperature. Incontrast, by making the bottom surface 4111B be in surface contact withthe planar front portion 412A, the heat conducted from thelight-emitting elements through the post can be effectively conducted tothe base member 412. Accordingly, the solid-state light sources 411 canbe cooled more effectively.

Further, by making the bottom surface 4111B be in surface contact withthe front portion 412A, it is possible to make the directions of therespective solid-state light sources 411 arranged on the base member 412coincide with each other. Through this, the directions of the lightemitted from the respective solid-state light sources 411 can be easilyadjusted. Accordingly, efforts to fine-adjust the optical axis directionof the parallelization lens 418 with respect to the central axis of thelight from the respective solid-state light sources 411 can be reduced.

Since the positions of the respective solid-state light sources 411 onthe base member 412 are determined by the openings 4131 and the convexportions 4132 of the spacer 413, the positional accuracy of therespective solid-state light sources 411 can be improved.

Further, since the spacer 413 has the heat conductivity, a path of heatconducted from the peripheral surface (side surface) of the stem 4111 tothe spacer 413 can be ensured in addition to a path of heat conductedfrom the bottom surface 4111B of the stem 4111 through the front portion412A. Accordingly, the heat generated from the solid-state light sources411 is effectively conducted, and thus the cooling of the solid-statelight sources 411 can be performed more effectively.

The substrate 416 that is in electrical contact with the terminals 4116of the solid-state light sources 411 is arranged on the rear portion412B that is opposite the side of the front portion 412A on which thestem 4111 is positioned in the base member 412. Through this, thecontact between the bottom surface 4111A of the stem 4111 and the frontportion 412A is not obstructed by the arrangement of the substrate 416.Accordingly, the contact area between the bottom surface 4111A and thefront portion 412A can be increased as compared with the case where thesubstrate 416 is positioned on the side of the front portion 412A onwhich the stem 4111 is positioned. Accordingly, the heat conduction fromthe stem 4111 to the base member 412 can be efficiently performed, andthus the solid-state light sources 411 can be cooled more effectively.

Here, if the X direction that is the length direction of the substrate416 and the A direction that is the direction for connecting the twoterminals 4116 are orthogonal to each other when the substrate 416 ismounted on the base member 412, it is necessary to ensure the widthdimension that is greater than the dimension for connecting at least twoterminals 4116 on the substrate 416.

For this, since the X direction and A direction are the same in the casewhere the two terminals 4116 are inserted into the hole portions 4121 ofthe base member 412, the width dimension of the substrate 416 can bereduced. Further, since the A directions for connecting the twoterminals 4116 are substantially the same in the respective solid-statelight sources 411 arranged along the X direction, a smaller substrate416 can be used. Accordingly, miniaturization of the substrate 416 canbe sought and the manufacturing cost of the substrate 416 can bereduced. In addition, since the area that is covered by the substrate416 on the base member 412 can be reduced, the dissipation area of theheat conducted to the base member 412 can be increased, and thus thesolid-state light sources 411 can be effectively cooled.

The substrate 416 is arranged in the groove portion 4122 formed on therear portion 412B. Through this, the substrate 416 can be stablyarranged.

In addition, although the heat dissipation member 417 is in contact withthe rear portion 412B, the substrate 416 is arranged in the grooveportion 4122, and thus the contact between the rear portion 412B and theheat dissipation member 417 is not obstructed by the substrate.Accordingly, the rear portion 412B and the heat dissipation member 417can be certainly in contact with each other, and the contact area can beexpanded. Accordingly, the heat of the solid-state light sources 411conducted to the base member 412 can be effectively conducted to theheat dissipation member 417, and thus the solid-state light sources 411can be cooled more effectively.

Modification of First Embodiment

FIG. 7 is a plan view illustrating a part of a light source unit 41according to a modification of the first embodiment.

In this embodiment, it is described that the respective projections 4142of the pressing member 414 are formed in a substantially trapezoidalshape in a plan view in which the width dimension becomes smaller as theprojections 4142 of the pressing member 414 is directed to the center ofthe opening 4141. However, instead of the pressing member 414, apressing member 611 of which the respective projections 6112 are formedin a rectangular shape in a plan view can be used.

This pressing member 611, as shown in FIG. 7, has the same configurationand function as the above-described pressing member 414 except that thepressing member 611 has the rectangular-shaped projections 6112 in aplan view instead of the projections 4142 of the substantiallytrapezoidal shape. That is, the pressing member 611 has the opening 6111that is the same as the opening 4141, and a pair of projections 6112 ofa rectangular shape in a plan view formed on the edge of the opening6111.

The projections 6112 pressingly fixes the solid-state light sources 411to the front portion 412A in contact with the upper surface 4111A of thestem 4111 positioned inside the opening 4131 when the spacer 413 and thepressing member 611 are mounted on the front portion 412A by the fixingmember 415 and the screws.

Even in the case of adopting such a pressing member 611, the same effectas the above-described projector 1 can be achieved. Further, on thepoint that the processing of the rectangular-shaped projections 6112 ina plan view is relatively easy, the manufacturing of the pressing member611 can be easily performed as compared with the pressing member 414having the trapezoidal-shaped projections 4142 in a plan view, and thusthe manufacturing cost of the pressing member 611, and further, thefirst light source device 4, can be reduced.

Second Embodiment

Hereinafter, a second embodiment of the invention will be described.

Although the projector according to this embodiment has the sameconfiguration and function as the above-described projector 1, itdiffers from the projector 1 on the point that each of the respectivesolid-state light sources 411 is pressingly fixed to the base member 412by one pressing member.

In the following description, the same reference numerals are given toportions that are equal to or substantially equal to the above-describedportions, and the description thereof will not be repeated.

FIG. 8 is a plan view illustrating a pressing member 612 of a projectoraccording to this embodiment.

The projector according to this embodiment has the same configurationand function as the projector 1 except that a plurality of pressingmembers 612 are provided instead of the pressing member 414 and thefixing member 415.

As shown in FIG. 8, the pressing members 612 is substantially “U”-shapedin a plan view, and mounting members such as screws mounted on thespacer 413 are inserted into and pass through hole portions 6121 whichare formed on the pressing members 612 and have both ends of an arcshape. Further, inside the respective hole portions 6121 on the pressingmember 612, an opening 6122 for ensuring a path of light that is emittedfrom the solid-state light source 411 pressed by the pressing member 612is formed, and a pair of projections 6123 are formed as a pressing unitin positions facing each other at the edge of the opening 6122.

The respective projections 6123 are formed to project from the edge ofthe opening 6122 to the center of the opening 6122 in the oppositedirection. The projections 6123 are in contact with the upper surface4111A of the solid-state light sources 411 arranged in the opening 4131when the pressing member 612 is mounted on the spacer 413, andpressingly fix the solid-state light sources 411 to the front portion412A.

In this embodiment, the projection 6123 is formed in a substantiallytrapezoidal shape in a plan view in which the width dimension becomessmaller as the projection 6123 projects from the edge of the opening6122. Because of this, in the same manner as the above-describedprojections 4142, a load applied to an area on the edge side in theprojection direction (area in the vicinity of the edge of the opening6122) can be dispersed. Further, the projection 6123 may be formed in arectangular shape in a plan view, as in the above-described projection6112,

When the pressing member 612 is mounted on the spacer 413, in the samemanner as the pair of projections 4142 as described above, theprojection direction of the projection 6123 from the edge of the opening6122 crosses the X direction that is the row direction and the Ydirection that is the column direction. Because of this, even if thesolid-state light sources 411 are densely arranged on the front portion412A, the pressing member 612 is arranged in the gap between thesolid-state light sources 411, and the solid-state light sources 411 canbe pressing fixed to the front portion 412A by the respectiveprojections 6123.

According to the projector according to this embodiment as describedabove, the following effects can be achieved in addition to the sameeffects as the above-described projector 1.

That is, since the respective solid-state light sources 411 areindividually press-fixed by the plurality of pressing members 612, eventhough a problem occurs in any one of the respective solid-state lightsources 411, the corresponding solid-state light source 411 in which theproblem has occurred can be individually taken off from the base member412 and the spacer 413 to be replaced. Accordingly, the replacement workof the solid-state light sources 411 can be easily performed.

Third Embodiment

Next, a third embodiment of the invention will be described.

The projector according to this embodiment has the same configurationand function as the above-described projector 1. Here, it is describedthat according to the projector 1, the extension direction of theprojection 4142 from the edge of the opening 4141 in the pressing member414 crosses the row direction and the column direction, which are the Xdirection and the Y direction. In the projector according to thisembodiment, the extension direction is parallel to the row direction. Onthis point, the projector according to this embodiment is different fromthe projector 1. In the following description, the same referencenumerals are given to portions that are equal to or substantially equalto the above-described portions, and the description thereof will not berepeated.

FIG. 9 is a plan view illustrating a pressing member 613 of a projectoraccording to this embodiment.

The projector according to this embodiment has the same configurationand function as the projector 1 except that the pressing member 613 isprovided instead of the pressing member 414.

As shown in FIG. 9, the pressing member 613 has a plurality ofrhombic-shaped openings 6131 in a plan view which are arranged in amatrix shape so as to form a plurality of rows and a plurality ofcolumns along the X direction and the Y direction. In the oppositepositions at the edges of the openings 6131, projections 6132 are formedas a pressing unit which extends from the edge to the direction close toeach other.

In the same manner as the above-described projections 4142, theprojections 6132 act a pressing force (spring force) in contact with theupper surface 4111A of the solid-state light source 411 positionedinside the opening 4131 of the spacer 413 when the projections 6132 arefixed to the front portion 412A by the fixing member 415 and the screws(not illustrated) in a state where the spacer 413 is placed between thebase member 412 and the front portion 412A, and pressingly fix thesolid-state light source 411 to the front portion 412A. Although theprojections 6132 is formed in a substantially trapezoidal shape in aplan view in which the width dimension becomes smaller as the projection6131 is directed to the center of the opening 6131, they may be formedin a rectangular shape in a plan view, as in the above-describedprojection 6112.

Further, in this embodiment, the hole portion 4121 in the base member412 and the openings 4131 and 4151 in the spacer 413 and the fixingmember 415 are formed depending on the forming position of the opening6131 of the pressing member 613.

In this embodiment, the projection direction from the edge of theopening 6131 of the projection 6132 is the X direction that is the rowdirection of the arrangement directions of the solid-state light sources411. Because of this, the pitch between the solid-state light sources411 in the X direction in the case where the pressing member 613 isadopted, as shown in FIG. 5, is larger than the pitch in the case wherethe pressing member 414 is adopted, but is smaller than the pitch in theY direction in the case where the pressing member 414 is adopted.Because of this, in the case where the pressing member 613 is adopted,the solid-state light sources 411 can be densely arranged in the Ydirection as compared with the case where the pressing member 414 isadopted.

According to the projector according to this embodiment as describedabove, the same effects as the above-described projector 1 can beachieved.

Modification of the Third Embodiment

In the above-described pressing member 613, the openings 6131 are formedin a matrix shape so as to form a plurality of rows and a plurality ofcolumns along the X direction and the Y direction. However, in two rowsof the openings adjacent to each other, the center position of theopenings that constitute one row and the center position of the openingsthat constitute the other row may have been shifted. That is, the centerposition of the opening adjacent to a certain opening in the Y directionmay pass through the center of the opening or may not be on a straightline.

FIG. 10 is a plan view illustrating a pressing member 614 that is amodification of the pressing member 613 according to this embodiment.

For example, according to the pressing member 614 that is a modificationof the pressing member 613, as shown in FIG. 10, the above-describedopenings 6131 are provided so as to form a plurality of rows and aplurality of columns along the X direction and the Y direction, and atthe edge of the opening 6131, a pair of projections 6132 are formed.

Regarding one row of two adjacent rows and the other row among theplurality of rows formed by the openings 6131, the center positions ofthe respective openings 6131 have been shifted with respect to the Xdirection.

Specifically, although the pitches between the openings 6131 along the Xdirection in the respective rows are the same, the openings 6131constituting the other row are respectively positioned in the positionson the straight line along the Y direction after passing through theintermediate position of the adjacent openings 6131 in the one row.

By arranging the openings 6131 as described above, the pitch between theopenings 6131 along the Y direction can be shortened as compared withthe above-described pressing member 613. Accordingly, the solid-statelight sources 411 can be arranged more densely on the front portion412A.

Fourth Embodiment

Next, a fourth embodiment of the invention will be described.

A projector of this embodiment has the same configuration and functionas the above-described projector 1. While the pressing member 414 in theprojector 1 has a pair of projections 4142, a pressing member in theprojector of this embodiment has three projections arranged at regularintervals at the edge of an opening. From this point, the projector ofthis embodiment is different from the projector 1. Note that, in thefollowing description, the same or substantially same parts as the partsdescribed above are represented by the same reference numerals, anddescription thereof will not be repeated.

FIG. 11 is a plan view illustrating a pressing member 615 in theprojector of this embodiment.

The projector of this embodiment has the same configuration and functionof the above-described projector 1, except that the pressing member 615is provided instead of the pressing member 414.

As shown in FIG. 11, the pressing member 615 has a plurality of openings6151 substantially having a triangular shape in a plan view formed at aposition corresponding to a hole portion 4121 of a base member 412 andan opening 4131 of a spacer 413. That is, the openings 6151 are arrangedin a matrix shape having a plurality of rows and a plurality of columnsin the X direction and the Y direction.

The openings 6151 are formed in the X direction and the Y direction suchthat the triangles are reversed. Accordingly, solid-state light sources411 can be arranged densely on a front portion 412A.

The hole portion 4121 of the base member 412, the opening 4131 of thespacer 413, and the opening 4151 of the fixing member 415 which are usedin this embodiment are formed at a position corresponding to the opening6151. The opening 4151 is substantially formed to have the same shape asthe corresponding opening 6151. For this reason, the opening 4151 issubstantially formed to have a triangular shape in a plan view.

In the vertex portions of the triangle at the edge of each opening 6151,projections 6152 each of which projects toward the center of the opening6151 are formed. That is, the projections 6152 are arranged at regularintervals at the edge of the opening 6151. When the pressing member 615is fixed to the front portion 412A by the fixing member 415 and screwsin a state where the spacer 413 is sandwiched between the pressingmember 615 and the front portion 412A of the base member 412, theprojections 6152 come into contact with the upper surface 4111A of thesolid-state light source 411 positioned in the opening 4131 of thespacer 413, and pressingly fixes the solid-state light source 411 to thefront portion 412A.

In this embodiment, each projection 6152 is formed to substantially havea trapezoidal shape in a plan view in which the width dimensiondecreases as projecting from the edge of the opening 6151. Accordingly,it is possible to disperse the load of a region of each projection 6152at the edge of the opening 6151, thereby suppressing damage to eachprojection 6152. However, the invention is not limited thereto, and likethe above-described projections 6112, the projections may be formed tosubstantially have a rectangular shape in a plan view.

According to the projector having the pressing member 615, not only thesame effects as the above-described projector 1 but also the followingeffects can be obtained.

That is, the pressing force (spring force) which presses the solid-statelight source 411 to the front portion 412A can be dispersed using theprojections 6152 and act on the upper surface 4111A. For this reason,since the pressing force which acts using the projections 6152 isreduced compared to a case where a pair of projections are provided, itis possible to reduce the amount of projection of each projection 6152from the edge of the opening 6151. Therefore, it is possible to arrangethe solid-state light sources 411 more densely and also to furtherreduce the size of the light source unit 41.

It is possible to reduce the load applied to each projection 6152,thereby suppressing damage to each projection 6152 compared to a casewhere two projections are formed.

The solid-state light source 411 is pressed by the projections 6152arranged at regular intervals at the edge of the opening 6151, therebymore stably fixing the solid-state light source 411 compared to a casewhere the solid-state light source is pressingly fixed using twoprojections.

Modification of Fourth Embodiment

FIG. 12 is a plan view showing a pressing member 616 which is amodification of the pressing member 615 of this embodiment.

The number of projections of the pressing member which presses and fixesthe solid-state light source 411 to the front portion 412A may be twolike the above-described pressing member 414, may be three like theabove-described pressing member 615, or may be four or more.

For example, the pressing member 616 shown in FIG. 12 has openings 6161substantially having a rectangular shape in a plan view arranged in amatrix shape having a plurality of rows and a plurality of columns inthe X direction and the Y direction.

In the vertex portions at the edge of each opening 6161, fourprojections 6162 which are pressing portions projecting toward thecenter of the opening 6161 are formed in total.

Similarly to the above-described projections 6152, when the pressingmember 615 is fixed to the front portion 412A by the fixing member 415and screws in a state where the spacer 413 is sandwiched between thepressing member 615 and the front portion 412A of the base member 412,these projections 6162 come into contact with the upper surface 4111A topress and fixe the solid-state light source 411 to the front portion412A.

Even when the pressing member 616 is used, the same effects as when thepressing member 615 is used can be obtained.

Similarly to the projections 6152, the projections 6162 are formed tosubstantially have a trapezoidal shape in a plan view in which the widthdimension decreases with projecting from the edge of the opening 6161.However, the invention is not limited thereto, and the projections maybe formed to have a rectangular shape in a plan view.

Fifth Embodiment

Next, a fifth embodiment of the invention will be described.

A projector of this embodiment has the same configuration and functionas the above-described projector 1. In the light source unit 41 of theprojector 1, in a state where a spacer 413, a pressing member 414, and afixing member 415 are laminated on a base member 412, the members 413 to415 are fixed to a front portion 412A by screws which pass through thesemembers 413 to 415. In contrast, in the light source unit of theprojector of this embodiment, the pressing member is fixed directly tothe front portion 412A. From this point, the projector of thisembodiment is different from the projector 1. Note that, in thefollowing description, the same or substantially same parts as the partsdescribed above are represented by the same reference numerals, anddescription thereof will not be repeated.

FIG. 13 is a perspective view showing a light source unit 41A of theprojector of this embodiment.

The projector of this embodiment has the same configuration and functionas the projector 1, except that a light source unit 41A is providedinstead of the light source unit 41.

Similarly to the light source unit 41, the light source unit 41A emitslight toward each reflection mirror 42. As shown in FIG. 13, the lightsource unit 41A has a plurality of solid-state light sources 411, a basemember 412, a pressing member 617, a substrate 416, and a heatdissipation member 417, and a parallelization lens 418 (notillustrated).

Similarly to the pressing member 414, when the pressing member 617 isattached to the front portion 412A of the base member 412, the pressingmember 617 pressingly fixes each solid-state light source 411 arrangedon the front portion 412A to the front portion 412A. The pressing member617 has a plurality of openings 4141 arranged in a matrix shape having aplurality of rows and a plurality of columns in the X direction and theY direction, and a pair of projections 4142 which are pressing portionsprojecting from the edge of each opening 4141 inward of the opening4141. As described above, each opening 4141 is formed at a positioncorresponding to the hole portion 4121.

The pressing member 617 has a pair of bent portions 6171 which are bentfrom both ends in the X direction in an opposite direction to the Zdirection, and a pair of fixing portions 6172 which extend in the Xdirection from the front ends of the bent portions 6171 to be away fromeach other.

Of these, though not illustrated, hole portions into which screws forfixing the pressing member 617 to the front portion 412A are insertedare formed in each fixing portion 6172.

The dimension of each bent portion 6171 in the Z direction issubstantially the same as the dimension of the above-described spacer413 in the Z direction. In other words, the dimension of each bentportion 6171 in the Z direction is slightly smaller than the thicknessdimension of the stem 4111 of the solid-state light source 411. For thisreason, if the pressing member 617 is screwed to the front portion 412Aby the fixing portions 6172, the projections 4142 are elasticallydeformed in a state of being in contact with the upper surface 4111A ofthe solid-state light source 411 to act the pressing force (springforce) for pressing the solid-state light source 411 toward the frontportion 412A on the solid-state light source 411. Accordingly, eachsolid-state light source 411 is pressingly fixed to the front portion412A.

According to the projector having the pressing member 617, the sameeffects as the above-described projector 1 can be obtained. Since thenumber of components of the light source unit 41A is smaller than thelight source unit 41, it is possible to reduce manufacturing costs ofthe light source unit 41A and to consequently reduce manufacturing costsof the projector.

Sixth Embodiment

Next, a sixth embodiment of the invention will be described.

A projector of this embodiment has the same configuration and functionas the above-described projector 1. In the light source unit 41 of theprojector 1, the spacer 413 is arranged on the base member 412, and thesolid-state light source 411 is arranged in the opening 4131 of thespacer 413. In contrast, in a light source unit of the projector of thisembodiment, a base member in which the base member 412 and the spacer413 are formed as a single body is used instead of the base member 412and the spacer 413. From this point, the projector of this embodiment isdifferent from the projector 1. Note that, in the following description,the same or substantially same parts as the parts described above arerepresented by the same reference numerals, and description thereof willnot be repeated.

FIG. 14 is an exploded perspective view illustrating a light source unit41B of the projector of this embodiment. In FIG. 14, for ease ofunderstanding, some parts are represented by reference numerals, and theparts substantially having the same shape as the parts represented byreference numerals are the same as the parts represented by referencenumerals.

The projector of this embodiment has the same configuration and functionas the projector 1, except that the light source unit 41B is providedinstead of the light source unit 41.

Similarly to the light source unit 41, the light source unit 41B emitslight toward each reflection mirror 42, and as shown in FIG. 14, has thesame configuration as the light source unit 41, except that a basemember 419 is provided instead of the base member 412 and the spacer413.

The base member 419 is formed of heat conductive metal to substantiallyhave a rectangular parallelepiped shape as a whole, and has a thicknessdimension corresponding to the total thickness dimension (the dimensionin the Z direction) of the base member 412 and the spacer 413. In a rearportion 419B of the base member 419, groove portions 4122 are formed.The base member 419 has holes to which screws for fixing a pressingmember 414, a fixing member 415, and a substrate 416 or screws forfixing a heat dissipation member 417 and the like are attached, and thelike.

In the base member 419, hole portions 4191 into which the solid-statelight sources 411 are inserted are formed in a matrix shape having aplurality of rows and a plurality of columns. In this embodiment, 16hole portions 4191 in total of 4 rows and 4 columns are formed.

The hole portions 4191 are formed in a back facing hole shape in whichthe diameter is reduced in two steps from a front portion 419A towardthe rear portion 419B. Specifically, each hole portion 4191 is formed bycombining a first hole portion 4192 which is positioned on the frontportion 419A side and substantially has a circular shape in a plan viewsubstantially having the same diameter and depth as the opening 4131 anda second hole portion 4193 which is positioned on the rear portion 419Bside and substantially has a long hole shape in a plan viewsubstantially having the same diameter and depth as the hole portion4121.

Among them, a convex portion 4132 is formed in a partial region at theedge of the first hole portion 4192. The second hole portion 4193 isformed at the center of a planar bottom portion 4192A in the first holeportion 4192, and the major axis direction of the second hole portion4193 is aligned with the X direction.

FIG. 15 is a cross-sectional view showing a part of the light sourceunit 41B.

When assembling the light source unit 41B, as shown in FIG. 15, first,the solid-state light source 411 is inserted into the hole portion 4191of the base member 419. At this time, the terminals 4116 of thesolid-state light source 411 are inserted into the second hole portion4193, and the bottom surface 4111B of the stem 4111 is brought intocontact with the planar bottom portion 6192A, and the convex portion4132 is inserted into the second concave portion 4113 (see FIG. 4), suchthat the solid-state light source 411 is inserted into the hole portion4191.

Next, the pressing member 414 is arranged on the front portion 419A. Atthis time, the pressing member 414 is arranged such that the cap 4114 ofthe solid-state light source 411 is positioned in the opening 4141 ofthe pressing member 414, and the projections 4142 formed at the edge ofthe opening 4141 come into contact with the upper surface 4111A of thestem 4111.

The fixing member 415 is fixed to the front portion 419A by screws orthe like such that the pressing member 414 is positioned between thefixing member 415 and the front portion 419A. At this time, the pressingmember 414 is positioned such that the cap 4114 is positioned in theopening 4151 of the fixing member 415. Accordingly, a region between theopenings 4151 presses the pressing member 414, such that the projections4142 in contact with the upper surface 4111A are bent, and the pressingforce for pressing the solid-state light source 411 toward the frontportion 419A acts on the upper surface 4111A, and the solid-state lightsource 411 is pressly fixed to the base member 419.

According to the projector having the base member 419, the same effectsas the above-described projector 1 can be obtained. Since the number ofcomponents of the light source unit 41B is smaller than the light sourceunit 41, it is possible to reduce manufacturing costs of the lightsource unit 41B and to consequently reduce manufacturing costs of theprojector.

Although in this embodiment, the pressing member 414 is used as thepressing member which pressingly fixes the solid-state light source 411to the base member 419, the invention is not limited thereto. Any one ofthe above-described pressing members 611 to 616 may be used.

Modifications of Embodiments

The invention is not limited to the foregoing embodiments, and includes,within the scope in which the object of the invention can be achieved,modifications, improvements, and the like. Further, the configurationobtained by combining the configurations in the above-describedembodiments is included in the invention.

Although in the first embodiment, the solid-state light source 411arranged on the base member 412 is pressed and fixed using the singlepressing member 414, the invention is not limited thereto. That is, aplurality of pressing members 414 which press a plurality of solid-statelight sources 411 may be provided. A plurality of pressing members 414may be used in an overlapping manner.

Although in the foregoing embodiments, the solid-state light sources 411are arranged in a matrix shape of four rows in the X direction and fourcolumns in the Y direction, the invention is not limited thereto. Thatis, the number of solid-state light sources 411 and the arrangement maybe appropriately changed. In this case, the forming positions of thehole portions of the base member and the openings of the spacer, thepressing member, and the fixing member and the number of hole portionsor openings may be changed depending on the arrangement of thesolid-state light sources 411.

Although in the foregoing first to fifth embodiments, the front portion412A in which the stem 4111 of the solid-state light source 411 ispositioned is formed to have a planar shape, the invention is notlimited thereto. That is, in the front portion 412A, the region incontact with the bottom surface 4111B of the stem 4111 may have a planarshape, and concavo-convexes may be formed in other regions. The sameapplies to the bottom portion 4192A in the hole portion 4191 of the basemember 419.

Although in the foregoing first to fourth embodiments, the opening 4131which substantially has a circular shape in a plan view and the convexportion 4132 which is formed at the edge of the opening 4131 andinserted into the second concave portion 4113 of the stem 4111 areformed in the spacer 413, and the opening 4131 and the convex portion4132 function as a positioning portion, the invention is not limitedthereto. That is, the solid-state light source 411 may be positionedusing a positioning portion having a different configuration, or theconvex portion and the concave portion may be provided reversely. Likethe light source unit 41A in the foregoing fifth embodiment, no spacer413 may be provided.

Although in the foregoing embodiments, the A direction which connectstwo terminals 4116 extending from the stem 4111 of the solid-state lightsource 411 is aligned with the X direction along the length direction ofthe base member 412 when the solid-state light source 411 is arranged onthe base member 412, the invention is not limited thereto. That is, thesolid-state light sources 411 may be arranged such that the A directionand the Y direction are aligned with each other. In this case, if thegroove portions 4122 are formed in the rear portion 412B in the Ydirection, and the substrates 416 are arranged in the groove portions4122, as in the foregoing embodiments, the effects, such as reduction inthe size of the substrates 416, can be obtained.

Although in the foregoing first to third, fifth, and sixth embodiments,the number of projections which are pressing portions formed at the edgeof the opening is two, and in the foregoing fourth embodiment, thenumber of projections is three and four, the invention is not limitedthereto. For example, the number of pressing portions which press thesingle solid-state light source may be one or five or more. That is, thenumber of pressing portions may be appropriately set. The shape of theopening formed in the pressing member may be appropriately changed.

Although in the foregoing embodiments, the bottom surface 4111B (in thestem 4111, the surface opposite the surface on which the light-emittingelement is provided) of the stem 4111 in the solid-state light source411 is thermally conductively in contact with the base member 412 or419, the invention is not limited thereto. That is, it should sufficethat, taking into consideration the projection direction of theterminals 4116 or the like, a predetermined region in the stem 4111 ofeach solid-state light source 411 is thermally conductively in contactwith the base member.

Although in the foregoing embodiments, the projector includes threelight modulating devices 34 (34R, 34G, and 34B), the invention is notlimited thereto. That is, the invention may be applied to a projectorwhich uses two or less light modulating device or four or more lightmodulating devices.

Although in the foregoing embodiments, a light modulating device havinga transmissive liquid crystal panel, in which a light incident surfaceand a light emitting surface are different is used, a light modulatingdevice having a reflective liquid crystal panel, in which a lightincident surface and a light emitting surface are identical, may beused.

Although in the foregoing embodiments, the projector includes the lightmodulating devices 34 each having a liquid crystal panel, a lightmodulating device having a different configuration may be used insofaras a light modulating device modulates incident light flux to form anoptical image in accordance with image information. For example, theinvention may be applied to a projector using a light modulating deviceother than liquid crystal, such as a device using a micromirror. Thekinds of optical components which are used in an optical device, thelayout of the optical components, and the like are not limited to thekinds and the layout described in the foregoing embodiments, and may beappropriately changed.

Although in the foregoing embodiments, the first light source device 4is used in the projector, the invention is not limited thereto. That is,a light source device having the configuration of the first light sourcedevice 4 may be used in an illumination device, such as a table lamp.

Although in the foregoing embodiments, the first light source device 4has, in addition to the light source unit 41, 41A, or 41B, thereflection mirror 42, the condensing lens 43, the case 44, theparallelization lens 45, the uniformization device 46, the dichroicprism 47, the pickup lens 48, and the wavelength conversion device 49,the invention is not limited thereto. That is, it should suffice thatalight source device having a configuration corresponding to the lightsource unit 41, 41 a, or 41B is used. The LD which is used in the lightsource unit is not limited to an LD which emits light in an ultravioletregion, and an LD which emits a different kind of light (for example,blue light). Instead of the LD, a solid-state light source, such as LED,may be used. The number of terminals of the solid-state light source maybe three or more.

The invention may be used in a light source device and the light sourcedevice may be suitably used as a light source device of a projector.

The entire disclosure of Japanese Patent Application No. 2011-173735,filed on Aug. 9, 2011 is expressly incorporated by reference herein.

What is claimed is:
 1. A light source device comprising: a plurality ofsolid-state light sources, each including a stem, a light-emittingelement provided on the stem, and a plurality of terminals connected tothe light-emitting element; a base member having a front portion, a rearportion, a hole portion, and a planar portion, the plurality ofsolid-state light sources being provided on the front portion, the holeportion penetrating through the base member from the front portion tothe rear portion, one of the plurality of terminals passing through thehole portion, the planar portion being in contact with the stem; and asubstrate disposed on the opposite side to the planar portion of thebase member, the substrate being in electrical contact with one of theplurality of terminals on the side of the rear portion of the basemember, wherein: the hole portion is an oblong hole in plan view, theplurality of solid-state light sources are arranged in one direction,the plurality of terminals of each solid-state light source includes afirst terminal and a second terminal provided on a surface that isopposite a surface on which the light-emitting elements are provided onthe stem, the first terminal and the second terminal of each solid-statelight source are aligned with each other in a direction that is alongthe one direction, and a length direction of the substrate is adirection that is along the one direction, the substrate having astrip-shaped portion extending in the one direction in a region betweena first solid-state light source and a second solid-state light sourceof the plurality of solid-state light sources.
 2. The light sourcedevice according to claim 1, wherein the planar portion is in contactwith a surface of the stem that is opposite the side on which thelight-emitting elements are provided.
 3. The light source deviceaccording to claim 1, further comprising a position determination memberwhich is mounted on the base member and is provided with a positiondetermination unit determining positions of the respective solid-statelight sources.
 4. The light source device according to claim 1, whereina groove portion in which the substrate is arranged is formed on therear portion that is opposite the planar portion side of the basemember.
 5. A projector comprising: the light source device according toclaim 1; a light modulating device modulating light flux emitted fromthe light source device; and a projection optical device projecting themodulated light flux.
 6. A projector comprising: the light source deviceaccording to claim 2; a light modulating device modulating light fluxemitted from the light source device; and a projection optical deviceprojecting the modulated light flux.
 7. A projector comprising: thelight source device according to claim 3; a light modulating devicemodulating light flux emitted from the light source device; and aprojection optical device projecting the modulated light flux.
 8. Aprojector comprising: the light source device according to claim 4; alight modulating device modulating light flux emitted from the lightsource device; and a projection optical device projecting the modulatedlight flux.
 9. A light source device comprising: a plurality ofsolid-state light sources, each including a stem, a light-emittingelement provided on the stem, and a plurality of terminals connected tothe light-emitting element; a base member having a front portion, a rearportion, a hole portion, and a planar portion, the plurality ofsolid-state light sources being provided on the front portion, the holeportion penetrating through the base member from the front portion tothe rear portion, one of the plurality of terminals passing through thehole portion, the planar portion being in contact with the stem; asubstrate disposed on the opposite side to the planar portion of thebase member, the substrate being in electrical contact with one of theplurality of terminals on the side of the rear portion of the basemember; and a wall that surrounds a solid-state light source of theplurality of solid-state light sources, wherein: the wall and the basemember are formed separately, the plurality of solid-state light sourcesare arranged in one direction, the plurality of terminals of eachsolid-state light source includes a first terminal and a second terminalprovided on a surface that is opposite a surface on which thelight-emitting elements are provided on the stem, the first terminal andthe second terminal of each solid-state light source are aligned witheach other in a direction that is along the one direction, and a lengthdirection of the substrate is a direction that is along the onedirection, the substrate having a strip-shaped portion extending in theone direction in a region between a first solid-state light source and asecond solid-state light source of the plurality of solid-state lightsources.
 10. The light source device according to claim 9, wherein theplanar portion is in contact with a surface of the stem that is oppositethe side on which the light-emitting elements are provided.
 11. Thelight source device according to claim 9, further comprising a positiondetermination member which is mounted on the base member and is providedwith a position determination unit determining positions of therespective solid-state light sources.
 12. The light source deviceaccording to claim 9, wherein a groove portion in which the substrate isarranged is formed on the rear portion that is opposite the planarportion side of the base member.
 13. A projector comprising: the lightsource device according to claim 9; a light modulating device modulatinglight flux emitted from the light source device; and a projectionoptical device projecting the modulated light flux.